Following a successful provisional period, both Geolah and Trans-Cab have received RSOLs that are valid from 1 January 2025 to 31 December 2027.
The last of TransCab's Compressed Natural Gas taxis was scrapped last month, due to limited refuelling stations and poor cost advantages over normal cabs.
Taxi firms took a big hit from private-hire companies earlier this year, but have since started partnering up with them.
Since late last year, taxi firms such as TransCab and Premier have been cutting rentals by up to 40 percent to attract hirers.
TransCab has announced that it will scrap 80 compressed natural gas-powered taxis that have failed Land Transport Authority inspections.
All Compressed Natural Gas (CNG) taxis are required to pass an inspection by tomorrow, this comes after two recent incidents of CNG taxis catching fire.
Four men, including an SCDF Officer who Malay Daily Berita Harian identified as Mr. Eka Putra, 20, were injured in Sunday's incident.
Prime, Singapore's smallest taxi operator, has shown interest in buying over SMRT's taxi business; following Grab's offer to do the same.
'Dynamic pricing', as used by GrabCar and Uber, means private-hire cars are generally cheaper than taxis during off-peak hours and after midnight.
Surge pricing adopted by private-hire apps has drawn flak from some commuters, after fares rocketed during periods of exceptionally high demand.
The fares, which will range from a few dollars to $100, are quoted upfront and could be lower or higher than standard metered rates; depending on demand.
Grab declined to confirm what percentage of the cut it would take and would only say that it would release more details next week.
Grab will be rolling out a new taxi service - JustGrab - which will provide fixed upfront fares when booking a taxi but will also be subject to surge pricing.
During major rail breakdowns, commuters have complained of Uber fares exceeding $140 - four to five times that of a usual taxi fare.
ComfortDelgro, the largest operator with a 60 percent market share, said two days ago that it would pass on the savings, without giving details.
The job of a taxi driver has become increasingly unattractive since Uber and Grab entered the market in 2013, say observers and drivers.
In a bid to attract more cabbies to drive for the company, TransCab, Singapore's second-largest taxi operator, is slashing rental fees.
The Land Transport Authority has found no evidence of mechanical fault after four months of investigations into 'sudden unintended acceleration' cases.
Up to 2,000 taxis are lying idle instead of plying the roads, unhired as factors such as higher rental and competition from taxi app firms bite.
ComfortDelGro has managed to fully meet the taxi availability standards set by the transport authorities while the other taxi companies all had lapses.